Question

我在Visual Studio 2015和SQL Server 2014中使用了SSRS / SSDT。有一个错误已经出现在＆gt;中。 8年you can't select multiple columns from different tables that have the same name。为了解决这个问题，我需要使用子查询。我找到的每个答案都会重写给定查询以删除子查询，这通常很好，但在这种情况下不适用。如何将参数传递给SQL Server中的子查询？

列别名不适用于此错误 - 使用AS会在＆＃34;复制＆＃34;上返回未知的列错误尽管列与其他所有列一起使用。 SELECT子句中的最后两行有效，因为正在查询这些值，因此报表可以使用它们，但实际查询的其余部分不会使用它们。

这是我当前的代码（由于子查询返回多行而无法正常工作）。

SELECT t.[Description],
       t.RequestedCompletionDate,
       t.CommitDate,
       t.StatusId,
       t.PriorityId,
       p.ProjectNumber,
       s.Name AS StatusDescription,
       pr.Name AS PriorityDescription
FROM ProjectTask t
inner join Project p
    on p.Id = t.ProjectId
inner join Project_TaskStatus s
    on s.Id = t.StatusId
inner join Project_Priority pr
    on pr.Id = t.PriorityId
WHERE t.Type = 'ET'
AND t.StatusId NOT IN (4,7)
AND
(
    SELECT StatusId FROM Project
    -- WHERE ?
)
NOT IN (3, 4)
ORDER BY t.PriorityId,
         t.CommitDate,
         t.RequestedCompletionDate

这是注释中请求的带别名的代码。它抛出一个错误：

SELECT t.[Description],
       t.RequestedCompletionDate,
       t.CommitDate,
       t.StatusId AS TaskStatusId,
       t.PriorityId,
       p.ProjectNumber,
       p.StatusId AS ProjectStatusId,
       s.Name AS StatusDescription,
       pr.Name AS PriorityDescription
FROM ProjectTask t
inner join Project p
    on p.Id = t.ProjectId
inner join Project_TaskStatus s
    on s.Id = TaskStatusId
inner join Project_Priority pr
    on pr.Id = t.PriorityId
WHERE t.Type = 'ET'
AND TaskStatusId NOT IN (4,7)
AND ProjectStatusId NOT IN (3,4)
ORDER BY t.PriorityId,
         t.CommitDate,
         t.RequestedCompletionDate

-- Invalid column name 'TaskStatusId'.
-- Invalid column name 'TaskStatusId'.
-- Invalid column name 'TaskStatusId'.
-- Invalid column name 'ProjectStatusId'.
-- Invalid column name 'ProjectStatusId'.

理想代码如下所示，但它会抛出错误An item with the same key has already been added，这是SSRS / SSDT在尝试返回多个同名列时抛出的错误。

SELECT t.[Description],
       t.RequestedCompletionDate,
       t.CommitDate,
       t.StatusId,
       t.PriorityId,
       p.ProjectNumber,
       p.StatusId,
       s.Name AS StatusDescription,
       pr.Name AS PriorityDescription
FROM ProjectTask t
inner join Project p
    on p.Id = t.ProjectId
inner join Project_TaskStatus s
    on s.Id = t.StatusId
inner join Project_Priority pr
    on pr.Id = t.PriorityId
WHERE t.Type = 'ET'
AND t.StatusId NOT IN (4,7)
AND p.StatusId NOT IN (3,4)
ORDER BY t.PriorityId,
         t.CommitDate,
         t.RequestedCompletionDate

Answer 1

当前代码（不起作用，因为子查询返回多个行）。

所以不是这个

AND
(
    SELECT StatusId FROM Project
    -- WHERE ?
)
NOT IN (3, 4)

你可以做到

AND
EXISTS (
    SELECT 1 FROM Project p2
    WHERE p2.StatusId IN (3, 4) AND p2.Id = p.Id
)

Answer 2

试试这个：

SELECT t.[Description],
       t.RequestedCompletionDate,
       t.CommitDate,
       t.StatusId AS TaskStatusId,
       t.PriorityId,
       p.ProjectNumber,
       p.StatusId AS ProjectStatusId,
       s.Name AS StatusDescription,
       pr.Name AS PriorityDescription
FROM ProjectTask t
inner join Project p
    on p.Id = t.ProjectId
inner join Project_TaskStatus s
    on s.Id = t.StatusId
inner join Project_Priority pr
    on pr.Id = t.PriorityId
WHERE t.Type = 'ET'
AND t.StatusId NOT IN (4,7)
AND p.StatusId NOT IN (3,4)
ORDER BY t.PriorityId,
         t.CommitDate,
         t.RequestedCompletionDate

Answer 3

修复很简单，重命名第二列，即b.Field1 AS Field01或者只是省略字段

Answer 4

我觉得这很愚蠢，但显然只能在子查询中调用UIView。它知道我引用父查询的值，即使它在子查询中。谢谢大家的帮助。

p.Id

将参数传递给子查询

4 个答案: